RT info:eu-repo/semantics/article
T1 Liquid–Liquid Equilibria for Systems Containing 4-Phenylbutan-2-one or Benzyl Ethanoate and Selected Alkanes
A1 Alonso Tristán, Cristina
A1 González López, Juan Antonio
A1 Hevia de los Mozos, Fernando
A1 García de la Fuente, Isaías
A1 Cobos, José Carlos .
K1 Electrical engineering
K1 Electrotecnia
AB Liquid−liquid equilibrium (LLE) phase diagramshave been determined, by means of the critical opalescence methodwith a laser scattering technique, for the mixtures 4-phenylbutan-2-one + CH3(CH2)nCH3 (n = 10,12,14) and for benzyl ethanoate +CH3(CH2)nCH3 (n = 12,14). The systems are characterized byhaving an upper critical solution temperature (UCST), whichincreases with n. The corresponding LLE curves show a ratherhorizontal top and become skewed toward higher mole fractions ofthe polar compound when n is increased. Calorimetric and LLEmeasurements show that, for mixtures with molecules with a givenfunctional group, interactions between aromatic molecules arestronger than those between homomorphic linear molecules(aromaticity effect). This has been ascribed to proximity effectsarising from the presence of the polar group and the aromatic ring within the same molecule. Proximity effects become weaker inthe sequence 1-phenylpropan-2-one >4-phenylbutan-2-one >1-phenylethanone and are more important in benzyl ethanoate thanin ethyl benzoate molecules. Values of the critical compositions and temperatures calculated with the DISQUAC groupcontribution model are in good agreement with the experimental results. Accordingly, the shape of the LLE curves is alsocorrectly described by DISQUAC.
PB American Chemical Society
SN 0021-9568
YR 2017
FD 2017-03
LK http://hdl.handle.net/10259/4698
UL http://hdl.handle.net/10259/4698
LA eng
NO Junta de Castilla y León, under Project BU034U16
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024